William H. Mevin attended the Liverpool School of Art, and began his career as a trainee film animator with Gaumont British in the late 1940s. He later worked on Batchelor and Halas's 1954 feature film, before becoming a topical cartoonist for the Sunday Chronicle.
He later turned to comic art, and contributed to Eagle Extra ('Marvel of M.I. 5'), Express Weekly ('Wee Sporty') and especially TV Comic, for which he drew series like 'Lenny the Lion', 'Supercar', 'Space Patrol', 'Dr Who', 'World Cup Willie', 'Bugs Bunny', 'Droopy' and 'Popeye', among others. In the 1970s and 1980s he also contributed to Pippin ('The Pogles', 'Bill and Ben', 'The Herbs', 'Morph') and Whizzer & Chips ('Happy Families').
For the Daily Mail, he produced the soap parody 'The Soapremes', before taking over the artwork on 'The Perishers' from Maurice Dodd, who kept doing the scripts. Mevin worked on the strip until Dodd's death in December 2005.